Astronomy:66 Aquarii

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Short description: Star in the constellation Aquarius
66 Aquarii
Diagram showing star positions and boundaries of the Aquarius constellation and its surroundings
Cercle rouge 100%.svg
Location of 66 Aquarii (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aquarius
Right ascension  22h 43m 35.23307s[1]
Declination –18° 49′ 49.3557″[1]
Apparent magnitude (V) 4.673[2]
Characteristics
Spectral type K3 III[3]
U−B color index +1.549[2]
B−V color index +1.376[2]
Variable type suspected[4]
Astrometry
Radial velocity (Rv)+21.6[5] km/s
Proper motion (μ) RA: –31.73[1] mas/yr
Dec.: –28.54[1] mas/yr
Parallax (π)7.53 ± 0.26[1] mas
Distance430 ± 10 ly
(133 ± 5 pc)
Absolute magnitude (MV)−0.93[6]
Details
Radius37[7] R☉
Luminosity434.08[6] L☉
Surface gravity (log g)2.06[8] cgs
Temperature4,170[8] K
Metallicity [Fe/H]–0.23[8] dex
Rotational velocity (v sin i)10[9] km/s
Other designations
66 Aqr, BD−19° 6324, HD 215167, HIP 112211, HR 8649, SAO 165252[10]
Database references
SIMBADdata

66 Aquarii is a single[11] star in the equatorial constellation of Aquarius. 66 Aquarii is the Flamsteed designation though the star also bears the Bayer designation of g1 Aquarii.[12] It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.673.[2] Based upon an annual parallax shift of 7.53 milliarcseconds,[1] the distance to this star is about 430 light-years (130 parsecs).

This is an evolved giant star with a stellar classification of K3 III.[3] It has expanded to 37 times the radius of the Sun[7] and is radiating 434[6] times the luminosity of the Sun from its outer envelope at an effective temperature of 4,170 K.[8] This gives it the orange-hued glow of a K-type star.[13] It is a suspected variable star that ranges in magnitude between 4.66 and 4.71.[4]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V. 
  2. ↑ 2.0 2.1 2.2 2.3 Jennens, P. A.; Helfer, H. L. (September 1975), "A new photometric metal abundance and luminosity calibration for field G and K giants.", Monthly Notices of the Royal Astronomical Society 172 (3): 667–679, doi:10.1093/mnras/172.3.667, Bibcode: 1975MNRAS.172..667J. 
  3. ↑ 3.0 3.1 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1988mcts.book.....H. 
  4. ↑ 4.0 4.1 Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V. (December 1998), "New Catalogue of Suspected Variable Stars. Supplement", Information Bulletin on Variable Stars, 1.0 4655: 1, Bibcode: 1998IBVS.4655....1K 
  5. ↑ Wilson, Ralph Elmer (1953), "General catalogue of stellar radial velocities", Carnegie Institute Washington D.C. Publication (Carnegie Institution of Washington), Bibcode: 1953GCRV..C......0W. 
  6. ↑ 6.0 6.1 6.2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics 367 (2): 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P. 
  8. ↑ 8.0 8.1 8.2 8.3 McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series 74: 1075–1128, doi:10.1086/191527, Bibcode: 1990ApJS...74.1075M. 
  9. ↑ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago 239 (1): 1, Bibcode: 1970CoAsi.239....1B. 
  10. ↑ "* g Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+g+Aqr. 
  11. ↑ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  12. ↑ HD 215167, database record, HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index, N. D. Kostjuk, Institute of Astronomy of Russian Academy of Sciences, 2002; CDS ID IV/27A.
  13. ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html, retrieved 2012-01-16 

External links



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